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- W1770967050 abstract "Transcription of the beta-casein gene in mammary epithelial cells is regulated by the lactogenic hormones insulin, glucocorticoids, and prolactin. The DNA sequence elements in the promoter which confer the action of the hormones on the transcriptional machinery and the nuclear proteins binding to this region have been investigated. We found that 221 nucleotides of promoter sequence 5' of the RNA start site are sufficient to mediate the induction of a chloramphenicol acetyltransferase reporter gene in transfected HC11 mammary epithelial cells. Deletion of 5' sequences to position -183 results in a construct with enhanced basal activity which still retains inducibility. A -170 beta-casein promoter-chloramphenicol acetyltransferase construct has very low transcriptional activity, which indicates the presence of a negative regulatory in the region between -221 and -183 and a positive regulatory element between -183 and -170. Band shift analysis showed that the promoter region between -194 and -163 specifically binds two nuclear proteins. The proteins are sequence-specific, single-stranded DNA-binding proteins which exclusively recognize the upper DNA strand and most likely play a repressing role in transcription. DNA binding activity of these nuclear proteins was observed only in nuclear extracts from mammary glands of mice in late pregnancy and postlactation, not during lactation. Hormonal control of the DNA binding activity of these proteins was also observed in the mammary epithelial cell line HC11. Mixing experiments showed that extracts from mammary tissue of lactating mice and from lactogenic hormone-treated HC11 cells contain an activity which can suppress the DNA binding of the single-stranded DNA-binding proteins.2+ identical specificity to the single-stranded DNA." @default.
- W1770967050 created "2016-06-24" @default.
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- W1770967050 date "1993-12-01" @default.
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- W1770967050 title "Interaction of two sequence-specific single-stranded DNA-binding proteins with an essential region of the beta-casein gene promoter is regulated by lactogenic hormones" @default.
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- W1770967050 doi "https://doi.org/10.1128/mcb.13.12.7303-7310.1993" @default.
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